Letter to Edmund Halley on the sun's parallax to the moon and other matters

Author: Isaac Newton

Source: EL/N1/60, Royal Society Library, London, UK

Published online: June 2014

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You'l receive the 2d Book on Thursday night or Friday by the Coach. I have directed it to be left with Mr Hunt at Gresham Coll. Pray let me beg the favour of a line or two to know of the receipt. I am obliged to you for pushing on the edition because of peoples expectation, thô otherwise I could be as well satisfied to let it rest a year or two longer. Tis a double favour that you are pleased to double your pains about it. Dr Wallis's papers may be long & I would not give you the trouble of transcribing them all. The heads may suffice. The resistence in swift motions is in a duplicate proportion to the celerity. The deduction of the Suns Parallax from the Moons variation I cannot promise now to consider. When Astronomers have examined whether there be such an inequality of her motion in the Quadratures as I mentioned in my last & determined the quantity thereof, I may take some occasion perhaps to tell them the reason. No more at present from